Damper control



Oct.. 7, 1930. L D HRNETT 1,777,848

' DAMPER CONTROL Filed Nov. 8, 192s 5 sheets-sheet 1 IN vvvvv 't RHARHGTT,

L. D. HARNETT DAMPE'R CONTROL Oct. 7, 1930.

Filed Nov. 8, 1928 3 Sheets-Sheet 2 D. HARNETT DAMPER CONTROL 3 Sheets-Sheet 5 @Mawr Filed Nov. 8, 1928 NN mw v MN, XV mm rm W i QN. Q p- 1w., um x, .n a w Num w mh mm f /w w( 2 i E 4W ,.WZ` Y VN, uw F Patented Oct. 7,"19310 UNITED -sTATEs PATENT oFFicE LEWIS n. HARNETT, or COLUMBUS, omo, AssiGNR To THE BUcxEYE izLoWER cou'- rm, or COLUMBUS, omo, A conromi'rroiv or omo DAMPER CONTROL Amalication led November 8, 1928. Serial No.318,082.`

This invention lrelates to apparatus for heating and Ventilating school-rooms, hospitals and the like, and has'for its object the control of the admission of air into the rooms in said buildings.

It is especiallyan object of this invention to provide means to control. the admission of air during high wind storms in Winter time, and other seasons of violent wind storms, the controlling means being operable manually.

For the purpose of illustration there is presented in the accompanying drawings a preferred embodiment of this invention, to which applicant does not Wish to be limited.

- In the accompanying drawings:

Figure 1 is a vertical section ofa part of a building, and of this apparatus installed therein. A Figure 2 is a section of the apparatus showdamper when it is to be manually operated. Figure 3 is a top plan view showing the air pressure means for operating the damper.

Figure 4 is a section on the line 4-4 of Figure 3.

Figure' 5 is a View similar to that shown in Figure 4 but with the damper open for the admission of air.

This apparatus is -used in connection withhospitals, schools and other similar buildings, and comprises in part a metallic casing in which are mounted the active features.

I In Figure 1 this apparatus is shown installed and ready for operation. The fresh air intake through the outside wall of the building is indicated by the numeral 1,'which may be closed by weatherproof storm louvers 2. On the inside of the building, usually be- '50 ranged to give the air the desired direction ing the means-for locking and shifting the purpose of Extending transversely and to one ,sideof the casing is a ledge 11, which has a downwardly extending part 12 having a felt pad 13 against which the upper part of the inlet damper is to engage when in one position. The other side of the casing has a like ledge 14, which has a corresponding downwardly inclined part 15 adapted to receive the damper when in its other position, This downwardly inclined part also has a felt pad 16 to be engaged 'by the damper. Each one of these felt pads is to form a complete airtight joint between these ledges and the damper 17. The damper 17 is pivotednear the central part of the base of the casing at a point 'indicated by theA numeral 18, and is adapted to be swung from engagement With one ledge to engagement with the other ledge.

Located 'along the pivot or hinge of the i damper is a felt pad 19 adapted to make the connection between the damper and the base of the casing as airtightas possible. Ex-

tending from the" damper are lug members 20. 'In the these lugs.

oted thereto one end of an adjustable link 21. This link 21 is pivoted at its other end,as

resent instance there are two of indicated by the numeral 22,to one end of' an arm 23, which has adjacent the pivot 22 ach one of the lugs 20 has piv-y a stop 24, which is adapted to contact with I part of the link 21' to holdthe link and 'the arm against going too far beyond dead center.`

On the other end of the arm 23 is a sleeve 25 which is fastened to the rod 26. This rod 26 extends longitudinally of the casing and is supported'by the end walls of the casing and two bracket members -27 On one end of the'rod 26,' withoutv the casing, is a fhandle 28, shown in dotted-line in FiguresflA and 2. Within the casing and also on the rod 26 is dle 28 does.

an arm 29 which extends in substantially the same direction from the rod 26 that-'the han- On the outer end of this arm 29 is a lug 30 to which a spring 31 is attached at one end. The other end of the spring 31 is attached to a small bracket 32 located in the base of the casing.

As shown in Figure 1 the damper is in position to prevent the entrance of outside air into the building. In this position the pivot point 22 is out of line with the pivot point of the rod 26 and the pivotal connection betweenthe lug 20 and the link 21 and are so held in this position. The spring 31 plays its part in maintaining this position but it alone could not do it without the assistance of the special structural relation between the arms and the link.

When itis desired to open the damper the lever 28 is shifted from the'position shown in Figure 1 so that the toggle connection is broken and the damper is brought from en- 'gagement with the pad 13 to engagement with the pad 15.

This same operation is illustrated in Figure 2. In Figure 2 the damper is shown in full line, in open position for the admission of air into the building. In this position the lever is 'shown in dotted line. If the lever were shifted so as to bring the links and 4arms into the position indicated by the dotted lines then the damper would be in closed position and the pivot point 22 would 'be beyond the line of centers andwould be in locked position, as indicated in dotted line. The sprin 31 would be in the position shown in dotted l(lines.

I-Iere we have described this apparatus as installed in a building and as manually operated. This means of operation is illustrated in Figures 1 and 2. While it is preferred to have the apparatus manually operated there is also provided air pressure and mechanical means for operating the apparatus.

In the air pressure operation of the apparatus the rod 26, instead of extending through the whole length of the casing, extends only part way of the. length. This rod, in this form, is supported by the brackets 27 alone. On one end of the rod there 'is a bifurcated arm vsimilar to the arm 28. This arm, in this instance, is indicated by the numeral 33, and has extending across the bifurcations a pin 34 adapted to pass through a hole in one end 35 of alever 36. v

The lever 36 is bell crank in shape and is pivoted near the elbow part 37 thereof to a stud 38 on the bracket 39, which is integral with the plate 40. The other end of Vthe lever 36 is adapted to fit in a guide member 41. Extending up from the other end of the plate 40 from the bracket 39 is another bracket 42 Yto whichis attached an air motor 43 in the form of a bellows.

Communicatingl with the air motor and passing through the upper part of the bracket 42 is an air pipe 44. This air pipe delivers air under pressure to the air motor for the purpose of operating the lever to shift the damper. The other end of the air motor consists of a disc member 45, which has attached thereto one end of a rod 46. The other end of the rod, after passing through the bracket 39, is pivoted to the le'ver 36 at the point indicated by the numeral 47. `Around this rod 46 is a spring member 48 seated between the disc member 4 5 and-the bracket 39, lwhich tends to hold the bellows in closed position and the lever 36 in a position to operate the arms and the links to close the damper, as illustrated in Figure 4.

The spring 48, acting through the bracket 39 and lever 36, tends to hold the damper in closed position to prevent the inrush of tempestuous or stormy air.V However, when the heated condition of the building becomes such that ventilation is needed, as when the building is to be closed, a lever is shifted to operate a valve to admit air under pressure to the motor so that the rod 46 is caused to move against the pressure of the spring 48 to shift the lever 36 in such a way that the toggle connection at the pivot 22 is shifted from the position shown in Figure 4 to that shown in Figure 5, and the damper is swung to the position illustrated in Figure 5 and the outer air is admitted into the casing and thence through the heatin coils, or through the'by-pass 8, or through both, and through the air mixing and air distributing grating 9 into the room.

Figures 3, 4 and 5 show the mechanically and air pressure operated form of this apparatus. When there is no pressure in the bellows the spring forces the bellows closed andoperates the lever 36 to rotate the rod 26vto bring the arms and links into the position shown in Figure 4. In the position here shown thepivots 22 are above the pivotal connections between the lugs 2O and the links 21', and between the arms 23 .and the rod 26, with the stops 24 engaging the adjacent parts of the links 21. In this position the links and arms securely hold the damper 17 closed against any violentvwind ressure.

For the purpose vof brea in the connection between the arms and the 1 s and shifting the damper from the closed to the o en position, pressure is admitted through t e pipe 46 into the motor, which causes the lever 36 to rock'the rod 26. The rod 26, being thus rocked, causes the toggle connection between the links 21 andthe arms 23 to be broken and the damper to shift from the closed to the open posltion for the admission of fresh air.

The air motor 43 may, through the pipe 44, be connected to someso'urce of air pressure. In the furnace room, or some other lon llll

tion such modifications as may be clearly embraced within my claims and the scope'of 4my invention'.

Having thus fully described my invention, what I claim is new and desire to secure by Letters Patent, is: v

1.- In a heating and Ventilating apparatus, a casing having an air inlet opening, means to close and keep said opening closed against high wind pressure, said means including toggle links and pressure operated means to shift said links toopen said passageway.

' v2. In a heating and Ventilating apparatus,

, a casing having an air inlet opening for the admission of air, means in said` opening to v control the admission of air, automatic means to operate 'said means to close lthe opening 7 In a heating and Ventilating apparatus in combination with a casing having an air inlet, a damper for said inlet, a shaft in said and the s aft, adapted in one position to hold the damper closed against violent winds and in another position to hold the damper open for the admission of air, means acting on said shaft to shift said toggle means to damper closed position, and pressure means adapted to act on said shaft to-shift said 'toggle means to open the damper.

'n casing, to gle means connecting the damper v In testimony whereof, Iailix my signature.

' LEWIS DQ I-IARNETT. A

and to lock said means in closed position, and

air pressure opera-ted means adapted to i* unlock said locking means and open' the opening for the admission of air.

3. In a heating and Ventilating apparatusfl; ,i

a casing havingan inlet for the admission o air, a damper 1n said inlet to control the admission of air, automatically operated tog# Vv gle means to lock said damper in closed position, and air pressure operated pressure means to shift the toggle to open said damper y' to permit the passage of air.

4' In u heatmg and Ventilating apparatus A in combination witha casing having. an air inlet,` a damper for said inlet, means havin one position to hold said damper close against violent wind pressure and another position to hold the damper open for them-v admission of air, and automatic and air pres sure means for shiftmg said means from one? position to the other.

5. In a heating and ventilatingiappawratiisvin combination with'a casing having an air inlet, 'a damper for said inlet, `sp1-'ing operated means for holding the 'damper closed against violent wind pressure, and 'a pressure operated motor for opening the damper for the admission of air. l

6. In a heating and Ventilating apparatus ln combination with a casing having an air inlet, a damper for said inlet, a shaft in said casmg, means connecting the damper and the shaft, adapted in one position vto hold the damper closed against violent winds and in another position to hold the damper open for the admission of air, means acting on said yshaft to shift said means to damper closed'position, vand pressure means adapted to act on said shaft to 'shift said means tov open the damper.

`Ill. 

